Machine for roughing shoe parts



Dec. 1, 1942. cuozzc) 2,303,439

MACHINE FOR ROUGKING SHOE PARTS Filed Nov. 18, 1940 s Shefcs-Sheet 1A/vE/v 70/? M 6 s 1:1,

Dec. 1, 1942. cuozzo 2,303,439

MAGHFENE FOR ROUGHING SHOE PARTS Filed Nov. 18, 1940 3 Sheets-Sheet 2N/E/vmQ 8 W? M a M. cuozzo MACHINE FOR ROUGHING SHOE PARTS Dec; 1, 1942.

s sheets-sneer:

Filed Nov. 18, 1940 Patented Dec. 1, 1942 MACHINE FGR ROUGHING SHOEPARTS Michele Cuozzo, Lynn, Mass assig'nor to United Shoe MachineryCorporation, Flemington, N. J a corporation of New Jersey ApplicationNovember 18, 1940, Serial No. 366,059

Claims.

This invention relates to machines for roughing shoe parts and ishereinafter described as embodied in a machine for producing a superiortype of roughing upon the marginal portion of a shoe part, such as asole, to prepare it for the reception of cement by which it is to beattached to another shoe part, in this case the shoe upper.

In the manufacture of shoes by the cement process, it is of the utmostimportance that the cement employed to secure the shoe parts togethershall be bonded as strongly as possible to said parts. To this end,especially when the material used is leather, it is necessary to preparethe surface of the work for the reception of the cement by a roughingoperation since, otherwise, the security with which the cements commonlyused (pyroxylin for example) are bonded to the leather is apt to beinadequate.

It is an object of the present invention to produce an improved machineby .the use of which a shoe part can be accurately and effectivelyroughed in such a manner that an extremely strong bond between thecement and the shoe part will be obtained.

To this end, a feature of the invention comprises the combination withmeans for feeding a work piece, such, for example, as a shoe sole,progressively past an operating station of a power-operated toolarranged to cut a multitude of closely adjacent gashes into thesubstance of a work piece by a chopping action. In the illustratedmachine, a reciprocating tool, somewhat resembling a chisel, is employedand the work is fed intermittently, a short distance at a time, betweensuccessive penetrations of the chopping tool into its substance. Theedge of the chisellike tool is preferably scalloped so that each gashmade by the tool forms a series of small flaps or tabs which will becaught and embedded in the cement and will provide a very strong bondtherewith. As shown, the tool is forced into the work in a direction atan oblique angle to the surface thereof to the end that the said flapsor tabs shall be raised somewhat from the general surface of the workpiece and, thus, the penetration of the cement will be facilitated.

The illustrated machine is provided with solefeeding mechanism which isentirely automatic in its action and is capable of advancing themarginal portion of a sole progressively past the chopping tool, even atthe sharply-curved portions of the sole edge, such, for example, as atthe toe, without requiring any assistance from the operator.

These and other features of the invention will 55 chines.

be understood and appreciated from the following detailed description ofone practical embodiment thereof when read in connection with theaccompanying drawings, in which.

Fig. l is a vertical, central section of the machine, taken from frontto rear;

Fig. 2 shows the front of the machine in elevation;

Fig. 3 is an angular View of the tool upon an enlarged scale;

Fig. 4 is a view in front elevation of the workfeed mechanism; and

Fig. '5 is a diagrammatic plan view showing the relation'of thedirection of application of workfeeding force to the positions of thework-guiding edge gages.

Referring now to Figs. 1 and 2, it] indicates a frame in which isjournaled a rotary shaft I2 having secured thereto a pulley l4 drivencontinuously by a belt it. At the front end of the shaft I2 is a crankis which, through a connecting rod 29, causes continual rapid verticalreciprocation of a tool bar 22 as the shaft rotates. The bar 22 isguided for sliding movement in bearings formed in brackets 24 and 26integral with the frame Hi. To the lower end of the tool bar 22 issecured, by screws 28, a chopping tool 35) which is best shown in Fig.3. All of the cutting edge 32 of the tool lies in the same horizontalplane, but it is formed in a series of scallops, as shown, in order toproduce at each penetration of the tool into the work a row of flaps ortabs as illustrated at 36 (Fig. 5). The curved wall 36 of each recess inthe tool is approximately vertical and the outside of the tool isbeveled off at the back, as shown at 38, in order to produce the cuttingedge.

The work piece, in this instance a shoe sole 4!],

rests upon and is fed over an inclined work supporting table 42 which ismounted upon a stationary extension 44 of the frame I 0. The inclinationof the table 42 is downward in the direction in which the sole isadvanced and, as a result, the gashes formed in the sole by the tool 30are oblique to the surface of the sole. The stroke of the tool 35) issuch that it penetrates the sole only a short distance, to a depth shownby the dotted line indicating the position of the cutting edge 32 inFig. 1.

The intermittent advance of the sole past the chopping tool is effectedby the feed mechanism illustrated in Figs. 1 and 4, most of which isalready known in the conventional four-motion work-feeding mechanismemployed in sewing ma- This mechanism is actuated by a crank 46 and acam 48 upon the shaft I2. The cam 48 is embraced by the forked upper endof a cam lever 50, which is pivoted at 52 to the upper end of a rockerarm 54 mounted to oscillate about a stationary pivot 56 fixed in theframe I0. The lower end of the cam lever 50 is pivotally connected at 58to a rocker arm 60 secured upon the rear end of a rock shaft 62 which isJ'ournaled for oscillation in the frame I0. Integral with the front endof the rock shaft 62 is a disk 64 in which is formed a straight guideway06 extending in an approximately vertical direction. A slide 68, whichis movable in the guideway 66, has an upwardly projecting finger Isurrounded by a collar 12 which is-rotatable upon ball bearings and isslidable longitudinally of said finger. A work-feeding claw I4 issecured by a set screw I6 to the upper end portion of the finger I0 anda compression spring I8, interposed between the hub of the claw and thecollar I2, tends to keep the collar down upon the surface of the worktable 42, regardless of the movement of the finger I0 and claw I4.

The slide 68 is provided with an aperture 88 in which a cam 82 engages.This cam is formed upon a rock shaft 84 which is journaled foroscillatory movement in the disk 64. The rear end of the rock shaft 84carries a rocker arm 86 upon the outer end of which is a roll 88.

A connecting rod 90 extends downward, from the crank 46 and its lowerend is pivoted at 92 to an arm 94, which is rigid with a rock shaft 06mounted for oscillation upon the stationary beartable 42 by a set screwI08 passing through a slot H0 in the plate I08.

By reference to Fig. 5, it will be seen that the feeding force exertedupon the 501g 40 by the i straight or not too sharply curved, but, inorder to insure perfect work feeding at portions of the work piece wherethe edge is sharply curved, as at the toe portion of a sole, the turningof the sole may be aided by applyin a retarding force to it at somepoint near the center of curvature of the sole edge. For this purpose, Ihave provided a ball I I2 mounted in the lower end of a rod II4 which isfreely slidable up and down through guiding sleeves I I6, I I8 havingspherical outer surfaces and mounted respectively in holders I28 andI22. The holder I is stationary and is mounted upon the front of thebracket 28, while the holder I22 consists of a block which is adjustableforward and rearward in a supporting frame I24 wherein the block is heldin adjusted ings in the frame I0. Extending upward from the rock shaft96 is an arm 90 the upper portion of which is forked, as shown at I00,and embraces the roll 88.

The operation of the above-described mechanism is as follows. Duringeach rotation of the shaft I2, the crank will cause one completereciprocation of the connecting rod 90 and, consequently, one completeoscillation of the rock shaft 96 and the arm 98 thereon. This, by reasonof the engagement of the roll 88 in the fork I00, effects a completeoscillation of the rock shaft 84 and the cam 82 at the front endthereof, the cam, in turn, causing the slide 68 and the work-feedingclaw to move up and down. While this is occurring, the cam 48 upon theshaft I2 effects a rocking movement of the cam lever 50,

which is hung upon the link 54, causing the link to swing about itsfixed pivot 58 with the result that the cam lever is moved up and downand oscillates the rock shaft 62 and the disk 84.

The total result of these operations is to impart to the feed claw I4 afour-motion feed movement during which it descends into engagement withthe sole, advances the sole a short distance along the table 42, risesaway from the sole, and n returns, out of engagement with the sole, toinitial position ready for repetition of the cycle of feeding movement.Each revolution of the shaft I2 causes one such complete cycle. Thedistance through which the sole is advanced in each step of the feedingmovement is preferably not much, if any, greater than the depth of thescallops formed by the cutting edge of the tool 30, and the result ofthe combined operation of the tool and the feed mechanism is a multitudeof closely adjacent gashes cut into, but not through, the

substance of the sole.

Th collar I2 is utilized as an edge gage for guiding the sole in itsadvancing movement and a second edge gage or guide I02, consisting of aroll mounted upon a screw I04 carried by a plate I08, is adjustably heldin position upon the work position by a nut I26 threaded upon a boltextending from the holder block I22 through a slot I28 in the side ofthe frame. The frame I24 is mounted for circular adjustment about ascrew I38 by which the frame is secured to the front portion of theupper bracket 24.

The sleeves H6 and H8 are held loosely in their respective holders sothat they are free for universal movement therein, and it is apparentthat the structural arrangement described above permits universaladjustment of the lower end of the rod II4 about a point which is at thecenter of the spherical sleeve H6 and that, consequently, the ball II2may be positioned to engage the sole 40 at any desired point. In orderthat the ball may press upon the sole with sufficient force to producethe desired retarding effeet, the upper portion of the rod H4 issurrounded by a compression spring I32 bearing against the under side ofthe block I22 and" against a collar I34 adjustably secured to the rodII4 by a thumb screw I35. A handle I38, secured to the rod II4 by a setscrew I40, facilitates the lifting of the rod II4 by the operator when asole is being placed in position to be operated upon.

Inasmuch as the marginal portions, and particularly the shank portions,of a sole are often beveled while the entire cutting edge of the toollies in a horizontal plane, provision is made for so presenting the soleto the tool that the entire cutting edge of the tool will enter the soleto the samedepth. For this purpose there is provided a supportingelement I42 which is movable about a stationary pivot I44 from ahorizontal position in which its upper surface is flush with the uppersurface of the work table surface of the sole parallel to the plane ofthe cutting edge of the tool.

From the foregoing it may be understood that, in the operation of themachine, a sole will be automatically advanced step by step in timedrelation to the reciprocations of the tool 30, with the edge of the soleagainst the edge gages 12, I02 and that the tool will be caused to makean inclined chopping cut into the upper face of the sole during eachperiod of rest in the advancing movement of the latter, with the resultthat a pattern of cuts or gashes, resembling that shown at 34 in Fig. 5,will be produced, forming a multitude of small elevated flaps or tabsaround and beneath which cement will flow readily to provide anexceptionally strong bond or anchorage of the cement to the sole.

Having described the invention, what is claimed as new and desired to besecured by Letters Patent of the United States is:

1. In a roughing machine for shoe parts, the combination of apower-operated, reciprocating, chopping tool, means for supporting ashoe part in such relation to said tool that the tool will cut into, butnot through, the shoe part, and work engaging means exclusive of thechopping tool for feeding the shoe part progressively over thesupporting means in position to be operated upon by the tool.

2. In a sole roughing machine, the combination of a power-operated,reciprocating, chopping tool, a work support adjacent to said tool insuch relation to the path of movement thereof that the tool will cutinto, but not through, a sole upon said support, and sole engaging meansexclusive of the chopping tool for feeding a sole intermittently overthe support between successive penetrations of the tool into the sole.

3. In a sole roughing machine, the combination of a power-operatedchopping tool having a scalloped cutting edge, a work support adjacentto said tool in such relation to the path of movement thereof that thetool will cut into, but not through, a sole upon said support, and soleengaging means exclusive of the chopping tool for feeding a soleintermittently over the support in steps approximating the depth of thescallops in the cutting edge of the tool.

4. In a sole roughing machine, the combination of a power-operatedroughing tool, a work support in operative relation to the tool, meansfor feeding the marginal portion of a; sole over the work support pastthe tool, sole edge guides arranged to engage the sole at opposite sidesof the line in which feeding force is applied to the sole, and aretarding device arranged to engage the surface of the sole at one sideof the feeding means opposite to one of the edge guides.

5. In a sole roughing machine, the combination of a power-operatedroughing tool, a work supporting table in operative relation to thetool, a pair of sole edge guides above the surface of said table, aretarding device spaced laterally from said guides and arranged toengage a sole upon the table, and sole feeding means engaging the solebetween the retarding device and the edge guides.

- MICHELE CUOZZO.

